Michael Freno 8496922aaf feat(player): waveform pipeline survives tab switches — 30s unload grace + braille spinner loading ...

The waveform's ffmpeg decode + cavacore FFT pipeline lived inside
RealtimeWaveform, so switching away from the Player tab unmounted it and
killed the pipeline instantly — respawning ffmpeg on every return.

Move the pipeline into a module-level store (stores/visualizer.ts) that
outlives the page:
- losing Player-tab focus keeps the pipeline warm for
  VISUALIZER_UNLOAD_DELAY_MS (30s), then tears it down (kills ffmpeg,
  destroys the cava plan); regaining focus within the delay resumes the
  warm pipeline with no restart churn; after an unload it restarts from
  the current playback position.
- playback signals move to utils/audio-signals.ts (module-level, no
  useAudio() owner needed) so the store reacts to play/pause/seek/speed
  while no Player page is mounted; useAudio re-imports them.
- render a braille spinner as the loading state for the visualizer
  (first play / after unload); stale bars stay on screen during warmup
  restarts so the waveform never blanks out for the network-bound cold
  start.
- seed the smooth position clock at pipeline start: with the position
  still frozen at 0 while mpv opens the stream, the reader sampled a
  1-sample window that could never fill, starving the bars until mpv's
  first poll.

Pins the store contract in tests/visualizer-store.test.ts: loading→bars,
warm resume without restart, 30s unload, and bars while position is
frozen at 0.

2026-08-11 14:07:58 -04:00

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